In-place sort instead of LINQ OrderByDescending

src/Verify/Serialization/Scrubbers/DirectoryReplacements_StringBuilder.cs

@@ -39,11 +39,11 @@ public static void Replace(StringBuilder builder, List<Pair> paths)
 
         var matches = FindMatches(builder, paths);
 
-        // Sort by position descending
-        var orderByDescending = matches.OrderByDescending(_ => _.Index);
+        // Sort by position descending. In-place to avoid LINQ allocation
+        matches.Sort((a, b) => b.Index.CompareTo(a.Index));
 
         // Apply matches
-        foreach (var match in orderByDescending)
+        foreach (var match in matches)
         {
             builder.Overwrite(match.Value, match.Index, match.Length);
         }

src/Verify/Serialization/Scrubbers/GuidScrubber.cs

@@ -15,11 +15,11 @@ public static void ReplaceGuids(StringBuilder builder, Counter counter)
 
         var matches = FindMatches(builder, counter);
 
-        // Sort by position descending
-        var orderByDescending = matches.OrderByDescending(_ => _.Index);
+        // Sort by position descending. In-place to avoid LINQ allocation
+        matches.Sort((a, b) => b.Index.CompareTo(a.Index));
 
         // Apply matches
-        foreach (var match in orderByDescending)
+        foreach (var match in matches)
         {
             builder.Overwrite(match.Value, match.Index, 36);
         }

src/Verify/Serialization/Scrubbers/UserMachineScrubber_PerformReplacements.cs

@@ -12,11 +12,11 @@ public static void PerformReplacements(StringBuilder builder, string find, strin
 
         var matches = FindMatches(builder, find);
 
-        // Sort by position descending
-        var orderByDescending = matches.OrderByDescending(_ => _);
+        // Sort by position descending. In-place to avoid LINQ allocation
+        matches.Sort((a, b) => b.CompareTo(a));
 
         // Apply matches
-        foreach (var match in orderByDescending)
+        foreach (var match in matches)
         {
             builder.Overwrite(replace, match, find.Length);
         }